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  Amazon once again refines the Kindle, this time losing the keyboard at the bottom in favor of a touch screen, making the form factor even smaller for the 6-inch diagonal e-ink pearl screen. It's actually 11% smaller and 8% lighter, at only 7.6 ounces. You can now borrow books from your public library (the "old" Kindle 3 just added this feature), and there's a new feature called X-Ray, a new feature that lets customers explore the “bones of the book.” With a single tap, readers can see all the passages across a book that mention ideas, fictional characters, historical figures, places or topics that interest them, as well as more detailed descriptions from Wikipedia and Shelfari, Amazon’s community-powered encyclopedia for book lovers. This is one of several new flavors of the Kindle, the Kindle Touch is available in four of its own, with or without free 3G (both have built-in Wi-Fi), and with or without special offers (ads). The latter, with special offers shaves $25 off the price. Cheapest one is $99 for Wi-Fi only and with special offers. It still has the same two-month battery life (with Wi-Fi turned off) between charges.